2. Atoms & Elements

Calculating Molar Mass

객관식
What is the primary purpose of determining the formula (molar) mass of a compound?
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객관식
Given a 0.125 g sample of copper(II) sulfate (CuSO4), how many moles of CuSO4 are present? (Molar mass of CuSO4 = 159.6 g/mol)
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객관식
How many total atoms are present in one formula unit of Al_2(CO_3)_3?
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객관식
What is the mass (in grams) of a single molecule of CCl_4?
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객관식
What is the mass of 4 moles of helium (He)?
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객관식
What is the molar mass of sodium chloride (NaCl)?
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객관식
Which of the following statements correctly describes the formula weight (molar mass) of a compound?
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객관식
What is the molar mass of sodium chloride (NaCl)?
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객관식
What is the mass (in grams) of 1.27 mol of water (H_2O)?
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객관식
How many total valence electrons are present in a molecule of CCl_4?
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객관식
How many oxygen atoms are present in one formula unit of Mg(OH)_2?
143
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객관식
How many hydrogen atoms are present in three formula units of ammonium benzoate, C6H5COONH4?
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객관식
Use the data in the table to calculate the atomic mass of silicon.

Exact Mass and Abundance of 3 Isotopes of Silicon

Isotope Isotopic Mass Abundance

²⁸Si 27.97693 amu 92.23%

²⁹Si 28.97649 amu 4.67%

³⁰Si 29.97376 amu 3.10%

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객관식
What is the mass (in grams) of 3.99 moles of krypton (Kr)?
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객관식
Which conversion factor should you use to convert moles of sodium (Na) to the mass of sodium?
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Isotope	Isotopic Mass	Abundance
²⁸Si	27.97693 amu	92.23%
²⁹Si	28.97649 amu	4.67%
³⁰Si	29.97376 amu	3.10%